Aurora Shooting: Officer Emotionally Recalls Slipping on Bloody Floor

As a body armor-clad James Holmes calmly told police about the explosives in his apartment, other officers raced to save victims of the movie-theater massacre, the first witnesses testified Monday in Holmes's preliminary hearing.

Officer Justin Grizzle choked up on the stand recalling slipping on the bloody floor as he encountered "several bodies throughout the theater laying motionless." He testified that, as he drove six victims to the hospital, "there was so much blood I could hear it sloshing around in the back of my car."

Among the victims of the Aurora, Colo., shooting he transported was Caleb Medley, a stand-up comedian who was shot in the head and is the last victim still hospitalized. Grizzle said Medley made a "god-awful" gurgling sound as he tried to breathe.

"I shouted, 'Don’t f–––ing die on me,'" Grizzle testified.

The first witness, Officer Jason Oviatt, testified that Holmes, a 25-year-old former neuroscience student, told them explosives in his apartment would go off if they were tripped.

"He was very relaxed," Oviatt testified. "It was like there weren't normal emotional responses."

The hearing, in Centennial, Colo., is to determine if there is sufficient evidence against Holmes on the 166 criminal charges in the July 20 attack, which killed 12 people and injured at least 70.

Some of the survivors are expected to testify during the week-long proceeding. Before this week, authorities had avoided discussing details and evidence about the highly publicized attack.